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# pib.py - functions for handling Montenegro PIB numbers
# coding: utf-8
#
# Copyright (C) 2022 Leandro Regueiro
# Copyright (C) 2022 Arthur de Jong
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
"""PIB (Poreski Identifikacioni Broj, Montenegro tax number).
This number consists of 8 digits.
More information:
* http://www.pretraga.crps.me:8083/
* https://www.vatify.eu/montenegro-vat-number.html
>>> validate('02655284')
'02655284'
>>> validate('02655283')
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> format('02655284')
'02655284'
"""
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
def compact(number):
"""Convert the number to the minimal representation.
This strips the number of any valid separators and removes surrounding
whitespace.
"""
return clean(number, ' ')
def calc_check_digit(number):
"""Calculate the check digit for the number."""
weights = (8, 7, 6, 5, 4, 3, 2)
return str((-sum(w * int(n) for w, n in zip(weights, number))) % 11 % 10)
def validate(number):
"""Check if the number is a valid Montenegro PIB number."""
number = compact(number)
if len(number) != 8:
raise InvalidLength()
if not isdigits(number):
raise InvalidFormat()
if number[-1] != calc_check_digit(number):
raise InvalidChecksum()
return number
def is_valid(number):
"""Check if the number is a valid Montenegro PIB number."""
try:
return bool(validate(number))
except ValidationError:
return False
def format(number):
"""Reformat the number to the standard presentation format."""
return compact(number)
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